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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfba83ea3ab9f478df9993fd6bcf5ed3fc8c888b1a2dbe6440fe901a1ef06d24' 
  AND token = 'CmxVv8G+iIleqRnacwIwto0MIdMYP+Yp+tk8PRAC0dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}